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The most basic and important thing is “what is the purpose of writing citations?”

When we research something, it is very important to note the sources which was based on, so that anyone can track back the sources and verify the result (or process) of the research.

Most of them might be “title of works”, but we should be aware that some of them are not. For example, fields like history, folklore, trial, journalism… sometimes their primary sources are individual’s statements. In that case, “title of works” will gonna be secondary or tertiary sources.

Since citations are for tracking roots of evidences, I don’t think it is necessary to exclude those “primary sources” (peoples bear words). It could be extremely important point for those field’s professionals.